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File No 94342-S&G Page 10 <br /> pumpage decreased, and in places, ground-water levels have recovered Land subsidence <br /> has virtually ceased <br /> Groundwater quality in the Central Valley is generally influenced by the water from streams <br /> ' that are a mayor source of recharge. <br /> Human activities have some influence on the concentration and location of water quality <br /> ' problems in the valley Significant increases in concentrations of dissolved solids and, <br /> specifically, dissolved nitrate indicate that groundwater quality is degrading as a result of <br /> increasing application of fertilizer in agricultural areas and the growth of urban population <br />' Before groundwater development, the flows stem of the Central Valle was in a state of <br /> P Y Y <br /> dynamic equilibrium, natural recharge was balanced by natural discharge Groundwater <br />' flowed toward the axial part of the valley and discharged primarily as evapotranspiration <br /> from marshes that existed prior to development <br />' 5 0 DISCUSSIONS <br /> The laboratory test results on the soil samples collected from the exploratory borings drilled <br /> at the site and at the depth collected revealed no detection or slight detection of total <br /> petroleum hydrocarbons as gasoline and diesel plus BTEX (Benzene, Toluene, Ethyl- <br /> Benzene, Total Xylenes) in the soils samples Also, total lead contents in the soil samples <br />' are well below the action levels established for this compound by the regulatory agencies <br /> The test results did not reveal any hologenated volatile organic compounds in the soil <br /> samples collected from the site <br />' Laboratory analyses conducted on the groundwater samples collected from the three <br /> morntoring wells at the site revealed concentration of contaminants that are exceeding <br />' drinking water standards for these compounds In monitoring wells MW-1 and MW-2, the <br /> amount of Benzene encountered in the groundwater sample is above one(1) parts per billion <br /> that is established for drinking water standards Total lead and hologenated volatile organic <br /> compounds were not detected in any of the groundwater samples collected from the site <br /> ADVANCE SOIL TECHNOLOGY INC <br />